Distortion free ophthalmic lens for presbyopia having wide range

Details Distortion free ophthalmic lens for presbyopia having wide range Distortion free ophthalmic lens for presbyopia having wide range

Filed on

1991-02-01

Date issued

1992-05-05

Examiner

Sugarman, Scott J.

Patent Class

Optics: eye examining, vision testing and correcting

SubClass

Spectacles and eyeglasses

SubSubClass

Ophthalmic lenses or blanks

Other Related Categories

G02C 706

Type

Patent

Status

active

Patent number

051101998

Description

ABSTRACT:
This invention relates to a lens for presbyopia free from distortional aberration for use in correcting an old-age eyesight. In the lens for presbyopia with a front lens surface having a smaller radius of curvature than a rear lens face, a lens surface has a refractive power successively corrected as the lens surface extends radially outwardly away from a geometric center of the lens so that lateral magnifications for all principal rays always equal a lateral magnification for a paraxial range. This construction is entirely free from distortional aberration, and secures a greatly enlarged range of distinct vision.

REFERENCES:
patent: 3486808 (1969-12-01), Hamblen
patent: 3687528 (1972-08-01), Maitenaz
patent: 3910691 (1975-10-01), Maitenaz
patent: 4856889 (1989-08-01), Guilino et al.

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